Well you read me wrong! I absolutely agree with you that working insane hours is, well, insane. It only personally happens to me in short bursts. I’m only stating that many grad students work crazy hours. You’re right in questioning the productivity of those hours, and also questioning how healthy this culture is and it’s certainly not my goal to spread the idea that, to be a good grad student, you must drive yourself insane. Just because it’s not the right approach doesn’t mean that those students do not work those crazy hours. It is a myth that it’s necessary/a good idea to work this much to succeed, it is not a myth that a lot of grad student do 60 hours of work a week.